Chemical mixing and pumping unit and methods for oilfield operations

Abstract

A method of mixing liquids in a tank includes inputting a first liquid into the tank through a first inlet, inputting a second liquid into the tank through a second inlet near the bottom of the tank and directing the second liquid towards a mixing paddle within the tank, and rotating the mixing paddle, thereby forming a mixture within the tank.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims benefit under 35 U.S.C. § 120 as a continuation application of U.S. application Ser. No. 15 / 000,181, filed Jan. 19, 2016 and allowed Aug. 30, 2018, the entirety of which is incorporated herein by reference.FIELD[0002]Embodiments disclosed herein relate to chemical mixing and pumping units and related methods for oilfield operations.BACKGROUND AND SUMMARY[0003]Coiled tubing operations in oil and gas wells generally involve delivering by large pumping units pressurized fluid mixtures downhole through a coiled tubing string. Chemical additives and lubricants are commonly added to fluid mixtures as an integral step for performing efficient coiled tubing operations. Chemical additives and lubricants have generally been hand mixed by personnel on the side in small batches and poured through an open top of a mixing tank associated with the pumping unit, or mixed in another unit and delivered to the pumping unit. However, ...

AI Technical Summary

Benefits of technology

The solution enables efficient and stable mixing of chemicals and water, reducing air incorporation and improving the quality of fluid mixtures for effective downhole operations, capable of handling specialized fluids without the issues of bubbling and improper mixing.

Problems solved by technology

However, these mixtures are generally inadequately mixed and unstable due to air in the mixture.

Moreover, water is poured into the mixture through an open top of a mixing tank causing the water to splash and bubble inside the tank.

The air pockets created result in an improper mixture and are detrimental to coiled tubing operations when forced downhole.

Previous mixing tanks have also generally been inadequate for running specialized fluid mixtures downhole, such as gel sweeps.

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